The Biosphere Reserve 'Dehang Debang' is located in

The Dehang-Debang (also spelled Dihang-Dibang) Biosphere Reserve is located in the Indian state of Arunachal Pradesh [c1][c2]. Established in 1998, it covers an area of approximately 5,111 square kilometers across the districts of Dibang Valley, Upper Siang, and West Siang [c2][t1][t6]. The reserve encompasses high mountain ranges of the Eastern Himalayas and the Mishmi Hills, with elevations reaching over 5,000 meters [t1][t9]. It includes protected areas such as Mouling National Park and Dibang Wildlife Sanctuary [t1][t10]. The region is known for its rich biodiversity, including rare fauna like the Mishmi takin, musk deer, and red goral [c2]. While other states like Meghalaya house the Nokrek Biosphere Reserve and Sikkim houses the Khangchendzonga Biosphere Reserve, Dehang-Debang is exclusively situated in Arunachal Pradesh [c2][c3].

Sources

1. [1] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 5: Natural Vegetation and National Parks > BIOSPHERE RESERVES > p. 49
2. [2] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 5: Natural Vegetation and National Parks > Table 5.8 > p. 50
3. [3] https://en.wikipedia.org/wiki/Dihang-Dibang_Biosphere_Reserve
4. [4] Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 4: BIODIVERSITY > zoning of Biosphere reserves > p. 37